$\left(1+x\right)\left(1-x-\frac{x^2}{2}\right)$
$\left(ab+c\right)\left(a^2b^2-abc+c^2\right)$
$\frac{x^6-27y^3}{x^2-3y}$
$-\left[4-\left(-2\right)\cdot5\right]+1\cdot\left(-1\right)-18$
$\frac{2x+1}{5}-\frac{1}{3}\left(2-x\right)>1$
$3x-6y=15$
$x\left(4\right)+x^2y$
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